[Q] Quick Settings switch when no notification - Purity ROM

I've just installed the Purity ROM 4.4.3 on my Nexus 4. I think it's the best ROM ever, but I noticed it hasn't the option "show quick settings panel when no notification", and it has only "left corner or right corner".
Is it possible to add this function?
Could anyone explain me how to do it?
For example i think I have to edit the systemUI.apk, but i don't know which files/strings i have to modify.

Thank you for the answer. I had already seen that function but i don't like it so much. i prefere the quick settings when no notification (i used it with gravity box, but i don't want to install xposed framework again because i get higher battery drainage, and Purity ROM is complete and fast, also

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